Two powder synthesis of hydrotalcite and hydrotalcite-like...

C - Chemistry – Metallurgy – 01 – B

Patent

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C01B 13/36 (2006.01) B01J 23/00 (2006.01) C01B 19/00 (2006.01) C01B 33/38 (2006.01) C01F 7/00 (2006.01) C01G 1/00 (2006.01) C01G 3/00 (2006.01) C01G 9/00 (2006.01) C01G 31/00 (2006.01) C01G 39/00 (2006.01) C01G 41/00 (2006.01) C01G 45/00 (2006.01) C01G 49/00 (2006.01) C01G 53/00 (2006.01) C07C 51/41 (2006.01)

Patent

CA 2197664

There is provided an improved method for making synthetic hydrotalcite by first reacting powdered magnesium oxide with a high surface area, transition alumina in a solution or suspension to form a meixnerite-like intermediate. This intermediate is then contacted with an anion source such as an acid, and most preferably carbon dioxide, to form the layered double hydroxide which is separated from the suspension by filtering, centrifugation, vacuum dehydration or other known means. On a preferred basis, the transition alumina combined with activated magnesia consists essentially of a rehydratable alumina powder having a surface area of 100 m2/g or greater. To make related double hydroxide compounds, still other reactants such as bromides, chlorides, boric acids, or salts thereof, may be subsituted for the carbon dioxide gas fed into this suspension.

L'invention concerne un procédé amélioré pour synthétiser de l'hydrotalcite. D'abord, on fait réagir une poudre d'oxyde de magnésium avec de la poudre d'alumine fine à surface spécifique élevée, en solution ou en suspension pour former un intermédiaire du type meixnérite. Cet intermédiaire est alors mis en contact avec une source d'anions telle qu'un acide et de préférence le gaz carbonique, pour former l'hydroxyde double lamellaire qui est isolé de la suspension par filtration ou centrifugation, puis séché sous vide ou par un autre procédé connu. Dans une forme d'exécution préférée, l'alumine fine qui est combinée avec la magnésie activée est constituée essentiellement d'une poudre d'alumine réhydratable ayant une surface spécifique de 100 m<2>/g ou plus. Pour réaliser des hydroxydes doubles apparentés, on peut remplacer le gaz carbonique introduit dans la suspension par d'autres réactifs tels que des bromures, des chlorures, l'acide borique ou ses sels.

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